$(document).ready(function () {
    // 鼠标进出box2的效果
    $("#box2").mouseover(function () {
        $("#box2").css("border","2px solid blue")
    });
    $("#box2").mouseout(function () {
        $("#box2").css("border","")
    });
    
    
    // 鼠标进出box3的效果
    $("#box3").mouseover(function () {
        $("#box3").css("border","2px solid green")
     });
    $("#box3").mouseout(function () {
        $("#box3").css("border","")
     });
});

